Question

[Phạm Thị Thùy Dương]

Tìm x,y,z biết:

1,\(\left(2x+1-3^{-1}\right)^2=16\)

2, \(\left(3x-2\right)^5=243\)

3. \(\left(x-3\right)^x=\left(x-3\right)^2\)

4. \(\left(\frac{-3}{4}\right)3x-1=\frac{256}{31}\)

5. \(5^{x+2}+5^{x+3}=750\)

6, \(3^{2x+1}\cdot7^y=3\cdot21^x\)

7.\(\frac{3^{2x+1}}{3^{2x+2}}=\frac{7x}{7y}\)

8. \(\frac{3^{3x}}{3^{2x-y}}=3^5;5^{x-6}\)